Javax.net.debug

If you set "javax.net.debug" to "help" as in :

System.setProperty("javax.net.debug","help");

It will produce this useful help, and then cause your app to exit.

all            turn on all debugging
ssl            turn on ssl debugging

The following can be used with ssl:
        record       enable per-record tracing
        handshake    print each handshake message
        keygen       print key generation data
        session      print session activity
        defaultctx   print default SSL initialization
        sslctx       print SSLContext tracing
        sessioncache print session cache tracing
        keymanager   print key manager tracing
        trustmanager print trust manager tracing
        pluggability print pluggability tracing

        handshake debugging can be widened with:
        data         hex dump of each handshake message
        verbose      verbose handshake message printing

        record debugging can be widened with:
        plaintext    hex dump of record plaintext
        packet       print raw SSL/TLS packets

If you have a problem with your SSL certificates, mutual authentication, cookie mangling, ssl session reuse, etc., these flags are your best bet for finding the problem. Often it's easy to turn on 'all' and the grep/cut/sed the meaningful parts of the log file.

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